Question

sendo a uma matriz de ordem 2 tal que aij=3i-j qual a soma dos seus elementos

Answer 1

$\large\boxed{\begin{array}{l}\rm a_{11}=3\cdot1-1=2\\\rm a_{12}=3\cdot1-2=1\\\rm a_{21}=3\cdot2-1=5\\\rm a_{22}=3\cdot2-2=4\\\rm\sum= 2+1+5+4=12\end{array}}$